SYSTEM Variable Syntax

<Variable name=”variableName” type="SYSTEM" [source=”*”]/>

where

variableName is the JavaScript system variable (mandatory
and the values could be ones that match these patterns: document.URL, document.domain,
location, doument.location, location.pathname, location.href, location.protocol,
location.hostname, location.host and location.port. All these are present
in the generic_ruleset. Do not modifiy these system var rules .

type specifies system type values (mandatory and
value is SYSTEM)

source is the URI of this pages (optional, default
value is *, meaning in any page)